JULABO LH 50 Highly Dynamic Temperature Control Systems - Manual (Page 62)

Troubleshooting guide / Error messages
62
Warning
CODE 40
Warnings without a complete shutdown of the unit
CODE 03
Excess temperature warning
CODE 04
Low temperature warning
CODE 20
Cooling of the condenser is affected. Clean air-cooled condenser.
Check the flow rate and cooling water temperature on water-cooled
condenser.
CODE 21 Compressor stage 1 does not work.
Check mains circuit breakers F1 and F3, both might have triggered.
Reset circuit breakers if necessary (see below).
CODE 40
Low liquid level warning in the internal reservoir
 These messages appear every 10 seconds as long as the compressor is
not switched on although requested by the instrument.
After a short cooling interval, the motor will be automatically reconnected
and the message " CODE XX " no longer appears.
 Press enter
to quit the audible signal
.
 After eliminating the malfunction, press the mains power switch off and
on again to cancel the alarm state.
If the unit cannot be returned to operation, contact an authorized JULABO
service station.
Disturbances that are not indicated.
Pump motor overload protection
The pump motor is protected against overloading. After a short cooling
interval, the motor will automatically start running.
16
A
M
P
16
A
M
P
16
A
M
P
16
A
M
P
Si1
Si4 Si2
Si3
LH47
LH50
Fuses:
The mains fuses are safety cutouts.
4 Mains circuit breakers (resettable) 16 A
F1 and F3  Compressor
F2 and F4 Heater, Pump
2 Mains circuit breakers (resettable) 10 A for the pump-motor
4 Mains circuit breakers (resettable) 16 A
0
1
Motor protection circuit breaker for compressor motor